Crack initiation and propagation under altering loading has been investigated for a number of technical alloys (AISI 301, PH-15-7Mo, D6-AC, HP9-4-25, Ti-6A1-4V). The parameters n(+) and N sub o relating to the crack propagation and initiation respectively have been introduced through the use of a crack propagation law suggested by Weiss and have been correlated with the specimen geometries and material properties. The parameter n(+) is thought to depend in some way on the strain hardening coefficient of the material and is found to provide an indication of the material's resistance to fatigue crack propagation. The parameter N sub o is related to the crack initiation times and a relation between N sub o, the geometry of the specimen, and the parameter n(+) has been proposed. (Author)
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